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About spatial and temporal

 
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jpsdr



Joined: 11 Aug 2008
Posts: 193

PostPosted: Fri Nov 27, 2015 9:17 am    Post subject: About spatial and temporal Reply with quote

I've a little question, just out of curiosity, and also, you can correct me if i'm saying something wrong.

One property of noise (at least white noise), is the mean value of 0. This allow using temporal aspect, to reconstruct the information, and in a way, minimise the loss of detail.
But, i'm curious, just in the big idea, not in detail, how temporal and spatial interact, in the case of course, both are active.
My guess is that the loss of information is almost done by the spatial filtering part. If spatial is applied before temporal, loss is definitive, and if temporal is applied after, it can help in the result, but may not realy help in keeping the details.
Are finaly the spatial and temporal parts mixed in some kind of way, interacting which each other (for exemple temporal is applied with and without spatial), which finaly help to reduce the loss of details, compared to a pure spatial ?
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NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Fri Nov 27, 2015 2:44 pm    Post subject: Reply with quote

Indeed, there are many possible ways of applying and combining different filters. The efficiency and accuracy of that may depend on specific algorithms. In Neat Video, we closely couple our temporal and spatial filters in such a way as to achieve best results in a variety of processing situations. It is difficult to explain how that is done without going into details. I would just say that we find that using the temporal filter is the primary option and enabling the spatial filter may be considered as an additional possible way to further reduce the remaining noise (when using the temporal filter alone is not sufficient). It is probably not very good idea to do that the other way around.

Vlad
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noise reduction for video and photos
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